JP3530039B2 - Instrument movement assembly structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movement assembling structure of an instrument, for example, showing a manner of assembling a movement for driving a pointer in an automobile instrument to an instrument case. 2. Description of the Related Art Conventionally, an assembling mode of an instrument case and a movement is as shown in FIG. Instrument case 1
The dial 3 is mounted on the front surface, while the printed wiring board 5 is mounted on the rear surface. On the back surface of the dial 3, there is provided a movement 7 for rotationally driving the hands 5 arranged on the front surface of the dial 3, and a plurality of electrical contact terminals 9 of the movement 7 are mounted on the female printed circuit board 5. The terminal 11 is fitted and connected. The instrument case 1 is formed with a through-hole 1a larger than the outer dimension of the movement 7, and the movement 7 is inserted into the through-hole 1a. [0003] However, in such a conventional structure, the through hole 1a provided in the instrument case 1 is simply formed to be large in order to set the movement 7. No particular consideration is given to the function of guiding or positioning the movement 7. For this reason, when setting the movement 7, it is not easy to insert the electrical contact terminal 9 into the female terminal 11 or the like.
Therefore, there is a problem that a play is generated and a stable assembled state cannot be obtained. Accordingly, an object of the present invention is to improve the workability when assembling a movement to a wiring board and to improve the stability of the movement after assembling. In order to achieve the above-mentioned object, according to the present invention, there is provided a wiring board in which a movement for rotating a pointer on a dial is mounted on a back side of an instrument case. In the movement assembling structure of the instrument, the instrument case is provided with a through hole corresponding to the movement, the through hole has a positioning portion having substantially the same diameter as the outer diameter of the movement, and the positioning portion has a through hole with respect to the through hole. A tapered portion whose inner diameter gradually increases toward the insertion port side of the movement, and from the positioning portion toward the wiring board side.
And a substrate-side tapered portion whose inner diameter gradually increases . [0007] According to the instrument movement assembling structure with such a configuration, when the movement is assembled from the instrument case side to the wiring board mounted on the back surface of the instrument case,
After being guided by the tapered portion of the through hole in the instrument case, the movement is positioned and fixed by the positioning portion. The movement is mounted on the wiring board.
The instrument case on the wiring board from the movement side
When attaching, the instrument case is
Guided by movement, movement of positioning part
Is positioned and fixed in the state corresponding to the position. [0010] Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a main part of an automotive instrument provided with an instrument movement assembling structure showing an embodiment of the present invention. A printed wiring board 15 is mounted on the back surface of the instrument case 13.
A back cover 17 is provided on the back side of the instrument case 13 so as to cover the
Is installed. On the front side of the instrument case 13, a dial 21 provided with a pointer 19 is mounted, and a facing and a front glass (not shown) are mounted respectively. FIG. 2 is a perspective view of the dial 21 shown in FIG.
A movement 23 for driving the motor 9 is provided. The movement 23 is provided around a bobbin case 25 for accommodating a bobbin around which a coil (not shown) is wound.
An annular case cover 27 is mounted. The case cover 27 has a locking claw 27a on the outer peripheral portion, and is fitted into the bobbin case 25 from the side opposite to the dial 21 so that the locking claw 27a is locked to the locking portion 29 integrated with the bobbin. Fixed. As for the portion not shown in the drawing on the opposite side to the locking claw 27a and the locking portion 29, the locking claw on the case cover 27 side is locked to the bobbin case 25. A terminal housing 33 for housing the electrical connection terminal 31 of the movement 23 is provided on the bobbin integrated with the locking portion 29.
Are provided to project outside the bobbin case 25.
The connection terminals 3 mounted on the printed wiring board 15 are provided on the outer peripheral portion of the case cover 27 corresponding to the terminal accommodating portions 33.
5 is formed. When the movement 23 is assembled to the printed wiring board 15, the connection terminal 35 is guided by the terminal guide 37, penetrates the terminal guide 37, and is connected to the electrical connection terminal 31. On the back surface of the dial 21, a spacer 39 is provided.
It is fixed by two screws 41 inserted from the surface of the dial 21. The spacer 39 has an engagement leg 43 that engages with the engagement hole 15 a formed in the printed wiring board 15. The engaging legs 43 are located on both sides of the terminal guide portion 37, and are provided in total of four. The engaging leg 43 is provided with an engaging claw 43a and a small protrusion 43b at its tip, and in a state where the engaging claw 43a is engaged with the engaging hole 15a and protrudes to the back side of the printed circuit board 15.
The small protrusion 43b is located on the front surface side of the printed wiring board 15, so that the spacer 39 is fixed to the printed wiring board 15. The base ends of the two engaging legs 43 facing each other are connected by a connecting portion 45, and the screw 41 is inserted into the connecting portion 45, and the connecting portion 45 is located on the opposite side of the dial 21 from the dial 21. A part of the bobbin in the vicinity of the terminal accommodating portion 33 of the movement 23 abuts on the surface, and the inserted screw 41 is screwed into a part of the bobbin to thereby move the movement 2.
3 is fixed to the dial 21 together with the spacer 39. A positioning pin 46 protrudes from the coupling portion 45 of the spacer 39 on the side of the terminal accommodating portion 33, and a positioning hole (not shown) formed in a bobbin near the terminal accommodating portion 33. , The spacer 39 and the movement 23 side are positioned. The instrument case 13 is formed with a through hole 47 corresponding to the movement 23, and the through hole 47 is formed with three guide walls 49 serving as guides for setting the movement 23. The three guide walls 49 are arranged at predetermined positions in the circumferential direction in order to avoid interference with the terminal guide portion 37 and the engagement leg 43 on the movement 23 side. FIG. 3 is a simplified side sectional view of the guide wall 49 in the instrument case 13 and the periphery thereof. Here, three guide walls 49 are connected to each other in the circumferential direction to form a cylindrical shape. It will be described as having been performed. The guide wall 49 is located substantially at the center of the through-hole 47 in the center axis direction (vertical direction in FIG. 3), and has a positioning portion which is substantially the same diameter as the outer diameter of the case cover 27 of the movement 23 or slightly larger. 49a, and a tapered portion 49b whose inner diameter gradually increases from the positioning portion 49a toward the insertion opening side of the movement 23 with respect to the through hole 47.
And Further, on the side opposite to the tapered portion 49b with respect to the positioning portion 49a, a substrate-side tapered portion 49c whose inner diameter gradually increases toward the printed wiring board 15 side.
Is formed. Next, the operation will be described. Movement 23
3 is mounted on the printed wiring board 15 side, as shown in FIG. 3, even if the movement 23 is slightly deviated from a regular mounting position as shown by a two-dot chain line, the movement 23 It is guided by the portion 49b and moves to the center of the through hole 47, and the outer peripheral portion is positioned at a position corresponding to the positioning portion 49a as shown in FIG. The assembling work of the movement 23 can be performed with or without the movement 23 and the spacer 39 fixed to the dial 21. When the movement 23 is positioned,
The connection terminal 35 on the side of the printed wiring board 15 enters the terminal guide portion 37 and is connected to the electrical contact terminal 31, and the engaging claw 43 a of the engaging leg 43 is
The spacer 39 is fixed to the printed wiring board 15 by engaging with the engaging hole 15a. As described above, when assembling the movement 23 to the printed wiring board 15 side, the movement 23 is guided and positioned by the tapered portion 49b, so that the connection and the engagement between the electric contact terminal 31 and the connection terminal 35 are established. Claw 43
a can be easily engaged with the engagement hole 15a, and the assembling workability of the movement 23 is improved. In addition, the movement 23 after the assembly is positioned and fixed by the positioning portion 49a having an inner diameter substantially equal to or slightly larger than the outer diameter of the movement 23, so that play is less likely to occur and the reliability as a product is improved. FIG. 5 shows an example in which the instrument case 13 is assembled later with the movement 23 attached to the printed wiring board 15. In this case, the movement 23 and the spacer 39 are assembled to the printed circuit board 15 in a state where they are not fixed to the dial 21, and
1 is attached after the instrument case 13 is assembled. In the example shown in FIG.
Is shifted from the normal position with respect to the movement 23, as shown by a two-dot chain line, the substrate side tapered portion 49c of the guide wall 49 in the instrument case 13 is
3 and is guided by the movement 23, and finally the outer peripheral portion of the movement 23 is positioned at a position corresponding to the positioning portion 49a, as shown in FIG. As described above, according to the first aspect of the present invention, when the movement is assembled from the instrument case side to the wiring board mounted on the back surface of the instrument case.
After the movement is guided by the tapered part of the through hole in the instrument case, it is positioned and fixed by the positioning part, so assembling workability is improved and play between the instrument case and the instrument case is reduced, and the reliability as a product The performance is improved. The movement is mounted on the wiring board.
The instrument case on the wiring board from the movement side
When attaching, the instrument case is
Guided by movement, movement of positioning part
Position is fixed in the position corresponding to
In this way, assembling workability is improved and the movement
And the reliability of the product is improved.
You. [0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a main part of an automotive instrument provided with an instrument movement assembling structure showing an embodiment of the present invention. FIG. 2 is a perspective view of the dial shown in FIG. 1 as viewed from the back side. FIG. 3 is a simplified side sectional view of a guide wall and its periphery in the instrument case of FIG. 1; FIG. 4 is a side sectional view showing a state where the movement is assembled from the state shown in FIG. 3; FIG. 5 is a side sectional view similar to FIG. 3, showing an example of assembling the instrument case after the movement. FIG. 6 is a side cross-sectional view of an instrument movement assembly structure showing a conventional example. [Description of Signs] 13 Instrument case 15 Printed wiring board 19 Hand 21 Dial 23 Movement 47 Through hole 49a Positioning part 49b Taper part 49c Board side taper part

Claims (1)

(57) [Claim 1] In a movement assembling structure of an instrument, wherein a movement for rotationally driving a pointer on a dial is attached to a wiring board mounted on a back side of an instrument case. A through-hole corresponding to the movement is provided in the case, and the through-hole has a positioning portion having substantially the same diameter as the outer diameter of the movement, and the inner diameter gradually increases from the positioning portion toward the insertion opening side of the movement with respect to the through-hole. Tapered part, and the inner diameter from the positioning part toward the wiring board
And a substrate-side tapered portion that gradually expands .